Brake



Sept. 20, 1927.

BRAKE Filed Jan. 8. 1926l 'A. Y. DODGE -EIT AL INVENTOR 'Aol El.. Y. Donar.

GD uw' green: G M o ATTORNEY satema sept. zo, 1927. j i UNITED` STATES AMEL Y. DODGE AND iEUGENE 'ro BENDIX BRAKE COMPANY,

G. MCDONALD, OF SOUTH BEND, INDIANA, ASSIGNOBS F CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

BRAKE.

Application led January This invention relates to bra-kes, and is illustrated as embodied in an internal expanding three-shoel Bendixl7 brake. A n

object of the invention is to provide posil tive but inexpensive positioning means for the shoes, or equivalent friction means, and for a floating self-centeringbrake-applying device.

In one desirable arrangement, interengag- 10 ing positioning devices are provided on t-he shoes or the like and on an adjacent support, having for example a flange-andve connection with each other, to position the shoes laterally. W'e prefer that l5 one or both of these parts have an additional function, so that they add nothing to the cost of the brake. Thus one device may be a' stop, preferably an adjustable eccentric,

and the other may be the pivot or other joint member connecting the shoes. This latter arrangement involves, as an additional feature of novelty the use of the joint member as the part engaging the stop to position the shoes when the brake is not a plied, whether or not it interlocks with tlib stop as just described.

Anotherv important feature of novelty re? preferably a novel lates to providing a stop,

for va floating ressed metal jeccentrlc,

,30 racket or other support carrying the outer end of the brake-a. 'plying shaft, thus limit ing movement o the support to insure against dragging of the shoes. 4

The above and other objects and features of the invention, including various novel combinations of parts and desirable particular construct-ions, will be apparent from the following description of one illustrative embodiment ,shown in the accompanying 4a drawings, in which: l

Fig. 1 is a vertical section throughjthe brake, just inside the wheel, showing the shoes in side elevation, and with the end of one shoe broken away; Fig. 2 is a section on the line 2-2 of Fig. 1, showin the joint between the shoes; and Fi 31s a radial section' on the line 33 of Fig. 1, showing the novel stop which posi tions the floating bracket.

The particular brake illustrated includes a drum 10 and backing plate 12, between which are arranged a shoe 14 anchored at 16 on the backing plate, a shoe 18 anchored at 20, and a floating or servo shoe 22. 65 Shoes 14 and 22 are preferably identical and 8v, 1926. Serial No. 79,948.

interchangeable, and are forked at their ends (see Fig. 2) to straddle opposite ends of shoe 18. This arrangement is more full describe-d in Patent No. 1,622,133, .granted Bendix Brake Company on application of A. Y. Dodge.

Shoes 14 and 22 are forced apart to ap ply the brake, bymeans such as a` double cam 24, against the resistance of a spring .26, and an auxiliary spring 28 insures that shoe 22 will first engage the drum and will then turn slightly with the drum to force shoe 18 aga-inst the drum. -A spring 30 connected to the backing plate may engage a pin 32 bridging an opening 34 in shoe 22, to urge the shoe laterally toward the backing plate.

Shoes 18 and 22 are shown connected by a novel pivot joint member 36, having near its end an annular groove 38 defining an end flange 40 received in a groove 42 in an ad instable eccentric 44. Groove 42 defines a flange 46 on the eccentric which projects into -the groove 38 of the joint member. This positively positions the shoes laterally.

In this particular case, eccentrc 44 also serves as an adjustable stop determining the idle position of the shoes, and against which the joint member 36 is urged by spring 28. Flanges 40 and 46 are wide enough so that the flange-and-groove joint between the parts does not separate even when the brake is applied, and there is no interference with brake-applying movement of the shoes.

Stop or eccentric 44 is shown carried by backing plate 12, and as having a head 48 outside the backing plate which can be gripped by a wrench in adjusting the stop. A nut 50 threaded on the stem of the sto serves to clamp it in any desired adjusted position. j

Cam 24 or the like is operated by a shaft 52 journalled in a freelyfloating support orl bracket 54. shown as held laterally by bolts 56 projecting through slots 58 in backin plate 12. In order to prevent shoes '14 and 22, with shaft 52 and support 54, from shifting too far to the left in Fig. 1 (forwardly of the car), thus permittinfr the shoe 22y to drag, support 54 is engagedzby the edge of a ynovel pressed-metal stop 6.0, having de pressed in its central portion a olygonal socket for'the head of al holt 62, y which it is attached to the backing late 12. Bolt 62 is slotted in its end, so tliat it maybe 110 and is clamped inzadjusted position by a nut 64.

While not limited to such use, the above arrangement is especially adapted for use with a control of the t e shown 1n Patent No. 1,613,024, granted endix Brake Company onfapplicationr of A. Y. Dodge, andin which-a levery fulcrumed on the axle or king pin operates a crank arm on the end of shaft 52, so that when the brake is not applied, the pressure ofthe lever on the crank arm serves to hold support 54against stop 60, thus preventingfshoe 14 from draggin While one illustrative embo imentof the invention has been described in detail, it is not our intention to limit its scope to that particular embodiment, or. otherwise'than by tor ythe terms of the appended claims.

1. A brake comprising, in combination', shoes,a support, a joint member connecting the shoes, and a stop `carried by the support and grooved to interengagel with one end of the joint member to osition the shoes later- 2. A brake comprising, in combination, shoes, a support, a joint member connectin the shoes, a stop carried by the support an grooved to interengage with one end of the joint member to positionthe shoes laterally and also when the brake is not applied, and a spring urging the joint member toward the .A- brake comprising, in combination, shoes, a. support, a joint'member connecting the shoes, and a stop carriedby the support and engaging. the joint member to position the shoes when .the brake is 'not applied, thejointV member and stop having interengaging parts preventin axial movement of the shoes without interiri'ng `with brake-apn plying movement of theshoes;

4. A brake comprising, in combination, shoes, a support, a joint member connecting the shoes, and a stopy carried bythe support andengaging the joint member to position the shoes whenthe brake is not applied, the joint member and stop having interfitting groove-and-fiange parts preventing axial movement of the shoes Without interfering With brake-applying movement of the shoes.-

5. A brake comprising, in combina-tion, shoes. a support, a joint member connecting the shoes, and a stop carried by the support and engaging the joint member to posi-,.-

tion the shoes when the brake is not applied, the stop being formed with a groove and the ,joint member having a fiange projecting into the groove to position the shoes axially without interfering with their brake-applying movement.

6. A brake comprising, inA combination,

shoes, a support, a joint member connecting the shoes., and a stop vcarried by the support connecting the shoes and having an annular ally and also when t e brake is not applied.A

and engagin the joint member to position L the shoes wen the brake in not applied, the joint member being formed with .a groove and the stop having al fiange project-- ing into the groove to position the shoesaxially without interfering with. their brake-4 applying movement.

7. A brake comprising, in combination, shoes, a support, a joint member connecting the shoes, `and an eccentric adjust-ably carried by thesupport and interlocked with the joint member to position the shoes when the brake is not applied. l

8. A 'brakecomprising in combination, shoes, a support, a joint member connecting the Shoes, and an eccentric adjustably carried by the support and-engaging the joint-member to position the 'shoes when the brake is: not applied, the joint member and stop hav v ing interengaging parts, preventing lateral 85 movement of the shoes without interfering with brakeapplying movement of the shoes.

9. A brake comprising, in combination, shoes, abacking plate, va pivot joint member groove about the end next the backing plate, and an eccentric shoe-positioning adjustable stop carried bythe backing plate and including a flange projecting into the groove.

10. A brake comprising, in combination, shoes, a backing plate, a pivot joint member connecting the shoes and having a flange at the end next the backing plate and-'an eccentric shoe-positioning adjustable v'sto' carried by the backing plate and forme with a groove embracing said flange. v11. A brake comprising, in combination, a.. friction member,.a backing plate, a part pro j' jecing laterally from the friction member an next the backin plate, and a stop for 'de'- termining the i le position of said member and having ajjlange projecting linto 'said'` 1 groove. p y j 12. A brake comprising, in combination, a '110 friction member, abacking plate, a. part pro- 13. A brake comprising, in combination, friction member, a backing plate, a part pro-- i-l jecting laterally from the friction member4 and havin an annular groove about the end next the acking plate, 'and an eccentric, adjustable sto for determining the idle osition of sai member carried by the backing plate vand having a flange projecting ijnto said groove. i

14. A brake comprisin vprojecting laterally from tliegfriction member and having a' flange at the end next the vbacking plate and an eccentric adjustable 'A having an annular groove about the end we groove'd toeiniis l iu in combination, j p, a friction member, a bac 'ng plate, appart..

stop for determining the idle position of said member carried by the backing plate and grooved to embrace said iange. l

15. A brake comprising, in combination, shoes, a floating pivot joint member connecting the shoes, and means engaging the pivot joint member and' acting through said member to position the shoes axially.

16. A brake comprising, in con'ibinntion, shoes, a floating pivot joint member connecting the shoes, and a device having an intcrfitting flange-and-groove connection with the pivot joint member and act-ing through said member to position the shoes laterally.

17. A brake comprising, in combination, a friction device, applying means including a shaft adjacent the ends of said device. a support in which the shaft is jonrnalled and which is mounted to float crosswise of said shaft, and a stop engaging said support to limit its movement in at least one direction.

18. A. brake comprising. in combination, a. friction device, applying means including a shaft adjacent the ends of said device, a v

support in which the shaft is journalled and Whch is mounted to float crosswise of said shaft, and an adjustable stop engaging said support to limit its movement in at least one direction.

1S). An adjustable positioning stop for a floating brake part including a pressed metal eccentric depressed in its central portion tc form a polygonal socket for an attaching device.

20. A brake comprising friction means, in coxnljiination with three devices spaced approximatel y equidistant about the brake and all three of holding the friction means against lateral movement, and one of which 1s operable to apply the brake, and one of which takes the braking torque.

In testimony` whereof, we have hereunto signed our names.

ADIEL Y. DODGE. EUGENE G. MGDONALD.

which include parts positively 

